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1. |
A rod made of Aluminium alloy (E = 72 GPa) has length 0.5 m and diameter 10 mm. The tensile stiffness (N/m) of this rod is |
A. | 10π × 105 |
B. | 36π × 105 |
C. | 9π ×105 |
D. | 12π × 105 |
E. | 36π ×106 |
Answer» C. 9π ×105 | |